Hearing appliance



' Aug. 7, 1935. M. IWASA 2,012,877

HEARING APPLIANCE Filed Oct. 9, 1933 Patented Aug. 27, 1935 UNITEDSTATES PATENT OFFICE HEARING APPLIANCE Morizo Iwasa, Nishiku, Osaka,Japan Application October 9, 1933, Serial No. 692,843 In Japan November3, 1932 9 Claims.

sound-wave is considerably magnified.

For this object, on one side of a bowl-shaped vessel a funnel-forminsertion is properly arranged to put in the human outer auditory canal.'In the interior of the vessel, a pair of vibrating discs, inner andouter, are eccentrically mounted and the centers are connected by meansof a lever. A fulcrum is specially made near the center of the outervibrating disc, so that the effect, when the sound-wave touches theouter vibrating disc, is enlarged by means of the lever, and it vibratesthe inner vibrating disc. This enlarged sound is planned to communicatedistinctly with the inner passage of the ear.

I have illustrated an embodiment of my invention in the drawing, inwhich:-

Fig. 1 is an elevation view of my invented hearing appliance.

Fig. 2 Ba sectional view alongthe line 2-2 of Fig. 1.

Fig. 3 is a sectional view along the line 3-3 of Fig. 1.

Fig. 4 is a sectional view along the line 4--4 of Fig. 2.

Fig. 5 is an enlarged view of a part of Fig. 4. In the drawing II is avessel having a bowlshape, and on one side of it a funnel-shapedinsertion I2 is provided, which is made to insert in the human auditoryinlet. A circular projection 13 is formed in the interior of the vesselon the lowerwall near at the bottom; and also a -semi-circularprojection I4, opening downward, is formed on the upper inlet. A ringframe I5 and a packing ring l6 are firmly put on these projectionsrespectively, on which the thin membranous vibrating discs l'! and I8,made of mica or glass or any other material are pressed, and the packingring i9 and the ring frame 20 are closely fastened on the discsrespectively. Thus a pair of vibrating discs, front and rear, are fixedeccentrically in the vessel.

2| is a lever having a bended part 22 and M on both ends, at whichthreaded smaller portions 24 are made. They are put in the small holes25 bored in each center of the vibrating discs respectively, arid fixedby nuts 26, and they are made air-tight by means of rosin or wax. Thelever=is supported, near the center point of the outer vibrating disc,by a knife edge 28 of the supporter 21 which is fixed to the vessel.

As explained in above, the sound-wave which vibrates the outer vibratingdisc is magnified proportionally to the distances between the fulcrumand each center of both outer and inner vibrating discs, and it isconveyed to the inner vibrating disc. 5

Between each vibrating disc there forms a magnifying chamber 29 whichis, through a funnel 30 bored in the vessel, connected with the interior of the inner vibrating disc, communicated with the passage 3iexcavated in the inside of the 10 I insertion l2. Accordingly, the airin the magnifying chamber expands and contracts affected by thevibrations made through each inner and outer vibrating disc, and itflows inward of the inner vibrating disc through the said passagecombin- 15 ing with the magnified sound generated at the back of theinner vibrating disc.

On the entry of the vessel ii there is fixed a perforated disc or anyother protective metal disc 32, and it protects the interior arrangementfrom damage.

As above explained, the sound-wave is remarkably magnified, and it feelsthe human auditory nerve very sensitive, so that those who have damagedtheir ear-drums or those who are hard of hearing will find efficacy byusing this hearing appliance.

Having described my invention as above, what is claimed is:

1. A hearing appliance comprising inner and outer vibrating discsmounted eccentrically in the inside of a vessel, each center of which isconnected with a lever, having a fulcrum near the center of the outervibrating disc. n

2. A hearing appliance, according to claim 1. comprising a circularprojection, formed in the interior of the vessel, on the lowerwall nearthe bottom, and also a semi-circular projection, opening downward,formed on the upper inlet, and having the vibratin discs on theseprojections respectively.

3. A hearing appliance, according to claim 1, comprising the vibratingdiscs fixed to each 'projection with ring frames and packing rings onboth sides.

4. A hearing appliance, according to claim 1, comprising the vibratingdiscs made of mica or glass or any other thin membranous material.

5.- A hearing appliance, according to claim 1, comprising threadedsmaller portions, formed at the bended parts of the lever, inserted inthe small central holes of the vibrating discs, making it air-tight bymeans of rosin or wax.

6. A hearing appliance, according to claim 1,

comprising the lever supported by a knife edge near the center of theouter vibrating disc.

7. A hearing appliance, according to claim 1, comprising a magnifyingchamber between inner 5 and outer vibrating discs, connected with theinterior of the inner vibrating disc through a. funnel.

8. A hearing appliance, according to claim 1,

comprising a suitable insertion to put in the hu-

